ABB REG670 - Circuit Breaker Spring Charge Monitoring

Inactive timer
The Inactive timer module calculates the number of days the circuit breaker has
remained in the same open or closed state. The value is calculated by monitoring the
states of the POSOPEN and POSCLOSE auxiliary contacts.
The number of inactive days INADAYS is available as a service value. The initial
number of inactive days is set using the InitInactDays parameter.
Alarm limit check
MONALM is initiated when the number of inactive days and hours exceed the limit
value defined by the InactiveAlDays and InactivAlHrs setting. The alarm signal
MONALM can be blocked by activating the binary input BLKALM.
16.4.7.7 Circuit breaker spring charge monitoring
The circuit breaker spring charge monitoring subfunction calculates the spring
charging time. The operation is described in Figure 435.
SPRCHRD
BLOCK
BLKALM
Spring charging
time
measurement
Alarm limit
Check
SPRCHRST
RSTSPCHT
SPCHT
SPCHALM
IEC12000621 V2 EN
Figure 435: Functional module diagram for circuit breaker spring charge
indication
Spring charging time measurement
The binary input SPRCHRST indicates the start of circuit breaker spring charging
time. SPRCHRD indicates that the circuit breaker spring is charged. The spring
charging time is calculated from the difference of these two signal timings. Spring
charging indication is described in Figure
435.
The last measured spring charging time SPCHT is provided as a service value. The
spring charging time SPCHT can be reset on the LHMI or by activating the input
RSTSPCHT.
Alarm limit check
If the time taken by the spring to charge is more than the value set with the
SpChAlmTime setting, the subfunction generates the SPCHALM alarm.
It is possible to block the SPCHALM alarm signal by activating the BLKALM binary
input.
Section 16 1MRK502052-UEN B
Monitoring
908
Technical manual